Tell this "friend" of yours that to turn the presentation title on its head with an obvious overview of the two (i.e range and tactical Ae size) but then focus on how the two types propagation work within the current structure. look at the UHF/VHF tactical and then step up to the long range and rear link use. Dont forget that some comms like HF offer technical advantages to overcome terrain when the Recce Offr has gone and picked a shit location in a valley for Bde HQ.